[问][413]在杨立民、徐克容编著、外语教学与研究出版社出版的College English第4册(修订本) 第10课“The American Character”中有这样一句话: They marry more,go broke more often and make more money than any other people.
Avian influenza (AI), or "bird flu", is caused by type A influenza virus. The symptoms can vary from a mild disease with little or no mortality to a highly fatal, rapidly spreading epidemic (highly pathogenic avian influenza), depending on the infecting virus strain, host factors, and environmental stressors.
